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GM patent reveals new two-stage turbocharger

Modern turbochargers may be some of the best ever made, but performance is something that engineers are always trying to improve. According to GM Inside News, General Motors (GM) is hoping to alleviate some of the negative aspects of a two-stage turbocharger setup with a newly-patented design. The patent, that was filed on May 19, 2016, reveals a clever bypass system that allows the engine, a four-cylinder unit, to optimize both the low-pressure and high-pressure inlets for its respective functions. According to the filing, a conventional two-stage turbocharger setup is engineered to allow both turbines to operate simultaneously at low and mid engine speeds. At high engine speeds, only the low-pressure turbine works. The setup can't isolate either the low or high pressure side, which can impair low-end performance. GM's new two-stage turbocharger setup looks to eliminate this by linking the high-pressure turbo to the exhaust manifold through the high-pressure inlet duct. The low-pressure turbo is attached to the high-pressure turbo by a low-pressure inlet duct, which is linked to a connecting channel. A single actuator that is housed in the exhaust manifold creates a bypass that can opens the high-pressure inlet or close the connecting channel. Depending on what the engine load and speed is, the ECU guides the actuator—a single rotating spindle with discs corresponding to flanges on the high and low pressure sides—to isolate one of the two turbos. Isolating the turbos allow the respective inlets to be engineered for the best possible fluid dynamic performance. The setup should increase performance and decrease lag. There's no word on what car this setup will make an appearance on, but it will most likely be used in premium vehicles before trickling down to the rest of GM's vehicles. Related Video: News Source: GM Inside News, AutoGuide via GM Authority Cadillac Chevrolet GM Technology Sedan turbo patent engine turbocharging

Cadillac's Euro reboot may have implications for US models, sales

Firmly on the comeback trail in the US, Cadillac is still trying to get out of the starting blocks in Europe. At the Geneva Motor Show in March, Cadillac' senior execs revealed plans to grow the brand's presence in a luxury market dominated by the big three German marques, Audi, BMW and Mercedes-Benz.
GM President Dan Ammann says he sees "enormous" potential for Cadillac globally.
Over the past 20 years, the General Motors premium nameplate has tried and failed multiple times to break into the European market. This time around, Cadillac recognizes that progress will be modest at best, and depends on specific changes to models, some of which may impact the brand's US lineup. Planned new sales tactics in Europe may also impact the way Cadillac does business on this side of the pond.

Cadillac CTS-V gets Stealth Blue and Silver Frost limited edition models

A little more than a year and a half ago, former weekend editor Alex Nunez and I were talking about how sweet it would be for Cadillac to offer a CTS-V in the Corvette's Supersonic Blue paint, and as if General Motors eavesdropped on our conversation, this showed up. And while the Stealth Blue car you see here isn't an exact duplicate of the hot-looking sedan GM showed off in prototype form, it's really close. And really sweet.
New for 2013, the Cadillac CTS range gets two new colorful editions, starting with the Stealth Blue package available on the CTS-V (in sedan, coupe and wagon bodystyles) as well as the naturally aspirated CTS coupe. In addition to the unique paint, blacked-out grille and dark satin wheels, Stealth Blue cars can also be done up with an optional Twilight Blue leather interior. (And you thought blue-on-blue color schemes died in the '90s.)
Cadillac is also offering a new Silver Frost package, but it's a bit more exclusive. Only 100 examples will be built, all in CTS-V Coupe form. The Silver Frost paint is a low-gloss matte finish, in that while it technically has a clearcoat covering, it's reduced in a way that the surface still appears flatter than standard paint. Even so, Cadillac states that the car should be hand-washed only.